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I've just updated Module:Language/data/wp_languages. {{lang-maz}} should now work as expected, and as for the user box and related categories: these should probably be deleted: they're unused and in an unusable form (we'd need an editor with a knowledge of Mazahuan to supply the userbox text). – Uanfala (talk) 11:25, 3 October 2019 (UTC)[reply]
I speedy deleted the category.--Ymblanter (talk) 07:20, 5 October 2019 (UTC)[reply]
Thanks, @Uanfala and Jonesey95: For the record, I think this work is now finished, e.g. [1][2][3][4]. Entries for Mazovian language seem to have been originated by user:Rejedef who was subsequently blocked for disruption and socking. – FayenaticLondon 13:41, 5 October 2019 (UTC)[reply]